What absorbs at 980 cm⁻¹ in an FTIR spectrum?
A band near 980 cm⁻¹ can point to several functional groups. Below are the most likely assignments, ranked by how much published evidence supports each — every one traceable to literature (DOI) and cross-validated against our 130,000+ reference spectra and knowledge graph.
Backed by 8 cited sources
Quick answer
A band near 980 cm⁻¹ is usually interpreted by checking which functional groups repeatedly co-occur there in the literature, then confirming at least one or two additional peaks in the same sample. This page ranks those assignments by accumulated evidence rather than by a single fixed textbook rule.
Возможные назначения функциональных групп
| Функциональная группа | Подтверждающие факты | Цитируемые источники | Максимальная достоверность |
|---|---|---|---|
| Silicon-oxygen (Si-O) | 12 | 12 | 1,0 |
| Silicon (Si) | 6 | 6 | 1,0 |
| C-O single bond | 6 | 4 | 1,0 |
| Methoxy (OCH3) | 4 | 2 | 1,0 |
| Methacrylate | 4 | 2 | 1,0 |
| Acetate | 4 | 2 | 1,0 |
| Phosphate (PO4) | 3 | 3 | 1,0 |
| Hydroxyl (O-H) | 3 | 3 | 1,0 |
| Alkyl C-H | 3 | 2 | 1,0 |
| Secondary amine | 2 | 2 | 1,0 |
| Thiol | 2 | 2 | 1,0 |
| C-S single bond | 2 | 2 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Sulfate (SO4) | 1 | 1 | 1,0 |
| Phosphorus | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| Silicon nitrogen | 1 | 1 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
| S eq o | 1 | 1 | 1,0 |
| N-O bond | 1 | 1 | 1,0 |
| Silicon silicon | 1 | 1 | 1,0 |
| Silanol (Si-OH) | 1 | 1 | 0,95 |
| Carbonyl (C=O) | 1 | 0 | 1,0 |
Ранжирование отражает накопленные литературные данные, а не единственное авторитетное правило. Всегда проверяйте в контексте вашего образца.
Possible materials
| Материал | Поддерживающие пики | Overlapping groups | Цитируемые источники |
|---|---|---|---|
| calcium carbonate | 980, 3232, 2954 | Silicon-oxygen (Si-O), C-O single bond, Methoxy (OCH3) | 1 |
| olivine | 980, 3525, 3564 | Silicon (Si) | 1 |
| zirconia | 980, 1100, 460 | Silicon-oxygen (Si-O) | 1 |
Materials are shown only when the same literature pool supports this band and at least one additional characteristic peak.
Spectrum logic
This band becomes meaningful only when read with its neighboring peaks. In practice, analysts first look at the assignments above, then check whether the same sample also shows other peaks expected for the same structural motif. A lone band near 980 cm⁻¹ is usually not enough for material identification by itself.
Real-world usage
This type of query is common in polymer identification, unknown plastic screening, QC troubleshooting, recycled-material verification, and literature-backed peak assignment review.
Common mistakes
- Treating one isolated band as proof of a material without checking at least one or two supporting peaks.
- Ignoring overlap: multiple functional groups can contribute near the same wavenumber.
- Skipping validation when additives, blends, oxidation, or contamination may distort the spectrum.
Verification advice
When ambiguity remains, validate the hypothesis with DSC, GC-MS, or TGA, especially for blends, degraded samples, and filled polymers.
Литература, лежащая в основе этих назначений
-
C-S single bond достоверность 1,0
“The appearance of new peaks around 975-985 and Accepted 1 May 2011 of cement paste has been attributed to the formation of two principal hydration products (C-S-H) and Available online 13 May 2011 2,respectively.Thereisastrongresemblanceofp”
Theoretical and experimental study of structures and properties of cement paste The nanostructural aspects of C–S–H DOI: 10.1016/j.jpcs.2011.05.001 -
Silicon silicon достоверность 1,0
“7 (a) Typical absorption, transmission and reflection spectra of cm(cid:3)1 for 30and 60-s Si-Si peaks are at 979.56 and 943.58 vertical SiNWs by electroless process.”
Synthesis and Characterization of Silicon Nanowires by Electroless Etching DOI: 10.1007/s11665-018-3179-z -
достоверность 1,0
“The broad absorption at 980 In the present study, quantitative analysis by FTIR cm(cid:2)1 is assigned to the symmetric and asymmetric S-O”
Boke 等 - 2004 - Quantification of CaCO3-CaSO3 center dot 0.5H(2)O- DOI: 10.1016/j.matlet.2003.07.008 -
достоверность 1,0
“A small exothermic peak around 980 °C corresponds to α-Al 2O transformation.”
Chandradass 和 Kim - 2009 - Effect of acidity on the citrate-nitrate combustio DOI: 10.1007/s12540-009-1039-y -
N-O bond достоверность 1,0
“The strongly shocked olivine with 80Fo% A.Kereszturietal./SpectrochimicaActaPartA:MolecularandBiomolecularSpectroscopy173(2017)637-646 640 cm-1 cm-1) cm-1 shocked olivines have no peaks above 980 and below 830 shifted with values between +1”
Analyzing Raman - Infrared spectral correlation in the recently found meteorite Csátalja DOI: 10.1016/j.saa.2016.10.012 -
S eq o достоверность 1,0
“This is the first time a PhysicalChemistryChemicalPhysicsAcceptedManuscript ethoxyethane) sulfonic acid or Aquivion®, with only one ether variable temperature IR study of Nafion thin films is being cm-1 group near the sulfonic acid did not”
Kollath 和 Karan - 2016 - New molecular scale insights into the alpha-transi DOI: 10.1039/C6CP04457C. -
Phosphate (PO4) достоверность 1,0
“cm-1 After phosphorylation process, a new peak at wavelength 980 observed which related cm-1 to P-O bond [18] and intense peak at wavelength 1226 due to P=O bond in accordance”
Synthesis, Characterization, and Performance of Graphene Oxide and Phosphorylated Graphene Oxide as Additive in Water-Based Drilling Fluids DOI: 10.1016/j.apsusc.2019.145005 -
C-O single bond достоверность 1,0
“If Glyoxal oligomer peaks at 1070 950 and 980 cm-1 C-OH both glyoxal monomers are singly hydrated at the outset, a are assigned to free stretch, dioxolane-linked dioxolane ring can be formed through a second, intramoC-OCasymmetricstretch,an”
Loeffler 等 - 2006 - Oligomer formation in evaporating aqueous glyoxal DOI: 10.1021/es060810wCCC
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